Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/scripts/Makefile.build

  1 # ==========================================================================
  2 # Building
  3 # ==========================================================================
  4 
  5 src := $(obj)
  6 
  7 PHONY := __build
  8 __build:
  9 
 10 # Init all relevant variables used in kbuild files so
 11 # 1) they have correct type
 12 # 2) they do not inherit any value from the environment
 13 obj-y :=
 14 obj-m :=
 15 lib-y :=
 16 lib-m :=
 17 always :=
 18 targets :=
 19 subdir-y :=
 20 subdir-m :=
 21 EXTRA_AFLAGS   :=
 22 EXTRA_CFLAGS   :=
 23 EXTRA_CPPFLAGS :=
 24 EXTRA_LDFLAGS  :=
 25 asflags-y  :=
 26 ccflags-y  :=
 27 cppflags-y :=
 28 ldflags-y  :=
 29 
 30 subdir-asflags-y :=
 31 subdir-ccflags-y :=
 32 
 33 # Read auto.conf if it exists, otherwise ignore
 34 -include include/config/auto.conf
 35 
 36 include scripts/Kbuild.include
 37 
 38 # For backward compatibility check that these variables do not change
 39 save-cflags := $(CFLAGS)
 40 
 41 # The filename Kbuild has precedence over Makefile
 42 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
 43 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
 44 include $(kbuild-file)
 45 
 46 # If the save-* variables changed error out
 47 ifeq ($(KBUILD_NOPEDANTIC),)
 48         ifneq ("$(save-cflags)","$(CFLAGS)")
 49                 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
 50         endif
 51 endif
 52 
 53 include scripts/Makefile.lib
 54 
 55 ifdef host-progs
 56 ifneq ($(hostprogs-y),$(host-progs))
 57 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
 58 hostprogs-y += $(host-progs)
 59 endif
 60 endif
 61 
 62 # Do not include host rules unless needed
 63 ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
 64 include scripts/Makefile.host
 65 endif
 66 
 67 ifneq ($(KBUILD_SRC),)
 68 # Create output directory if not already present
 69 _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
 70 
 71 # Create directories for object files if directory does not exist
 72 # Needed when obj-y := dir/file.o syntax is used
 73 _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
 74 endif
 75 
 76 ifndef obj
 77 $(warning kbuild: Makefile.build is included improperly)
 78 endif
 79 
 80 # ===========================================================================
 81 
 82 ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
 83 lib-target := $(obj)/lib.a
 84 obj-y += $(obj)/lib-ksyms.o
 85 endif
 86 
 87 ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
 88 builtin-target := $(obj)/built-in.o
 89 endif
 90 
 91 modorder-target := $(obj)/modules.order
 92 
 93 # We keep a list of all modules in $(MODVERDIR)
 94 
 95 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
 96          $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
 97          $(subdir-ym) $(always)
 98         @:
 99 
100 # Linus' kernel sanity checking tool
101 ifneq ($(KBUILD_CHECKSRC),0)
102   ifeq ($(KBUILD_CHECKSRC),2)
103     quiet_cmd_force_checksrc = CHECK   $<
104           cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
105   else
106       quiet_cmd_checksrc     = CHECK   $<
107             cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
108   endif
109 endif
110 
111 # Do section mismatch analysis for each module/built-in.o
112 ifdef CONFIG_DEBUG_SECTION_MISMATCH
113   cmd_secanalysis = ; scripts/mod/modpost $@
114 endif
115 
116 # Compile C sources (.c)
117 # ---------------------------------------------------------------------------
118 
119 # Default is built-in, unless we know otherwise
120 modkern_cflags =                                          \
121         $(if $(part-of-module),                           \
122                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
123                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
124 quiet_modtag := $(empty)   $(empty)
125 
126 $(real-objs-m)        : part-of-module := y
127 $(real-objs-m:.o=.i)  : part-of-module := y
128 $(real-objs-m:.o=.s)  : part-of-module := y
129 $(real-objs-m:.o=.lst): part-of-module := y
130 
131 $(real-objs-m)        : quiet_modtag := [M]
132 $(real-objs-m:.o=.i)  : quiet_modtag := [M]
133 $(real-objs-m:.o=.s)  : quiet_modtag := [M]
134 $(real-objs-m:.o=.lst): quiet_modtag := [M]
135 
136 $(obj-m)              : quiet_modtag := [M]
137 
138 # Default for not multi-part modules
139 modname = $(basetarget)
140 
141 $(multi-objs-m)         : modname = $(modname-multi)
142 $(multi-objs-m:.o=.i)   : modname = $(modname-multi)
143 $(multi-objs-m:.o=.s)   : modname = $(modname-multi)
144 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
145 $(multi-objs-y)         : modname = $(modname-multi)
146 $(multi-objs-y:.o=.i)   : modname = $(modname-multi)
147 $(multi-objs-y:.o=.s)   : modname = $(modname-multi)
148 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
149 
150 quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
151 cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
152 
153 $(obj)/%.s: $(src)/%.c FORCE
154         $(call if_changed_dep,cc_s_c)
155 
156 quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
157 cmd_cpp_i_c       = $(CPP) $(c_flags) -o $@ $<
158 
159 $(obj)/%.i: $(src)/%.c FORCE
160         $(call if_changed_dep,cpp_i_c)
161 
162 # These mirror gensymtypes_S and co below, keep them in synch.
163 cmd_gensymtypes_c =                                                         \
164     $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
165     $(GENKSYMS) $(if $(1), -T $(2))                                         \
166      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
167      $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \
168      $(if $(KBUILD_PRESERVE),-p)                                            \
169      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
170 
171 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
172 cmd_cc_symtypes_c =                                                         \
173     set -e;                                                                 \
174     $(call cmd_gensymtypes_c,true,$@) >/dev/null;                           \
175     test -s $@ || rm -f $@
176 
177 $(obj)/%.symtypes : $(src)/%.c FORCE
178         $(call cmd,cc_symtypes_c)
179 
180 # C (.c) files
181 # The C file is compiled and updated dependency information is generated.
182 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
183 
184 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
185 
186 ifndef CONFIG_MODVERSIONS
187 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
188 
189 else
190 # When module versioning is enabled the following steps are executed:
191 # o compile a .tmp_<file>.o from <file>.c
192 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
193 #   not export symbols, we just rename .tmp_<file>.o to <file>.o and
194 #   are done.
195 # o otherwise, we calculate symbol versions using the good old
196 #   genksyms on the preprocessed source and postprocess them in a way
197 #   that they are usable as a linker script
198 # o generate <file>.o from .tmp_<file>.o using the linker to
199 #   replace the unresolved symbols __crc_exported_symbol with
200 #   the actual value of the checksum generated by genksyms
201 
202 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
203 
204 cmd_modversions_c =                                                             \
205         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
206                 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))  \
207                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
208                                                                                 \
209                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
210                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
211                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
212         else                                                                    \
213                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
214         fi;
215 endif
216 
217 ifdef CONFIG_FTRACE_MCOUNT_RECORD
218 ifdef BUILD_C_RECORDMCOUNT
219 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
220   RECORDMCOUNT_FLAGS = -w
221 endif
222 # Due to recursion, we must skip empty.o.
223 # The empty.o file is created in the make process in order to determine
224 #  the target endianness and word size. It is made before all other C
225 #  files, including recordmcount.
226 sub_cmd_record_mcount =                                 \
227         if [ $(@) != "scripts/mod/empty.o" ]; then      \
228                 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";   \
229         fi;
230 recordmcount_source := $(srctree)/scripts/recordmcount.c \
231                     $(srctree)/scripts/recordmcount.h
232 else
233 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
234         "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
235         "$(if $(CONFIG_64BIT),64,32)" \
236         "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
237         "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
238         "$(if $(part-of-module),1,0)" "$(@)";
239 recordmcount_source := $(srctree)/scripts/recordmcount.pl
240 endif
241 cmd_record_mcount =                                             \
242         if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" =   \
243              "$(CC_FLAGS_FTRACE)" ]; then                       \
244                 $(sub_cmd_record_mcount)                        \
245         fi;
246 endif
247 
248 ifdef CONFIG_STACK_VALIDATION
249 ifneq ($(SKIP_STACK_VALIDATION),1)
250 
251 __objtool_obj := $(objtree)/tools/objtool/objtool
252 
253 objtool_args = check
254 ifndef CONFIG_FRAME_POINTER
255 objtool_args += --no-fp
256 endif
257 
258 # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
259 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
260 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
261 cmd_objtool = $(if $(patsubst y%,, \
262         $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
263         $(__objtool_obj) $(objtool_args) "$(@)";)
264 objtool_obj = $(if $(patsubst y%,, \
265         $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
266         $(__objtool_obj))
267 
268 endif # SKIP_STACK_VALIDATION
269 endif # CONFIG_STACK_VALIDATION
270 
271 define rule_cc_o_c
272         $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
273         $(call cmd_and_fixdep,cc_o_c)                                     \
274         $(cmd_modversions_c)                                              \
275         $(cmd_objtool)                                                    \
276         $(call echo-cmd,record_mcount) $(cmd_record_mcount)
277 endef
278 
279 define rule_as_o_S
280         $(call cmd_and_fixdep,as_o_S)                                     \
281         $(cmd_modversions_S)                                              \
282         $(cmd_objtool)
283 endef
284 
285 # List module undefined symbols (or empty line if not enabled)
286 ifdef CONFIG_TRIM_UNUSED_KSYMS
287 cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
288 else
289 cmd_undef_syms = echo
290 endif
291 
292 # Built-in and composite module parts
293 $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
294         $(call cmd,force_checksrc)
295         $(call if_changed_rule,cc_o_c)
296 
297 # Single-part modules are special since we need to mark them in $(MODVERDIR)
298 
299 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
300         $(call cmd,force_checksrc)
301         $(call if_changed_rule,cc_o_c)
302         @{ echo $(@:.o=.ko); echo $@; \
303            $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
304 
305 quiet_cmd_cc_lst_c = MKLST   $@
306       cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
307                      $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
308                                      System.map $(OBJDUMP) > $@
309 
310 $(obj)/%.lst: $(src)/%.c FORCE
311         $(call if_changed_dep,cc_lst_c)
312 
313 # Compile assembler sources (.S)
314 # ---------------------------------------------------------------------------
315 
316 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
317 
318 $(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
319 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
320 
321 # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
322 # or a file that it includes, in order to get versioned symbols. We build a
323 # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
324 # the .S file (with trailing ';'), and run genksyms on that, to extract vers.
325 #
326 # This is convoluted. The .S file must first be preprocessed to run guards and
327 # expand names, then the resulting exports must be constructed into plain
328 # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
329 # to make the genksyms input.
330 #
331 # These mirror gensymtypes_c and co above, keep them in synch.
332 cmd_gensymtypes_S =                                                         \
333     (echo "\#include <linux/kernel.h>" ;                                    \
334      echo "\#include <asm/asm-prototypes.h>" ;                              \
335     $(CPP) $(a_flags) $< |                                                  \
336      grep "\<___EXPORT_SYMBOL\>" |                                          \
337      sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
338     $(CPP) -D__GENKSYMS__ $(c_flags) -xc - |                                \
339     $(GENKSYMS) $(if $(1), -T $(2))                                         \
340      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
341      $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \
342      $(if $(KBUILD_PRESERVE),-p)                                            \
343      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
344 
345 quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
346 cmd_cc_symtypes_S =                                                         \
347     set -e;                                                                 \
348     $(call cmd_gensymtypes_S,true,$@) >/dev/null;                           \
349     test -s $@ || rm -f $@
350 
351 $(obj)/%.symtypes : $(src)/%.S FORCE
352         $(call cmd,cc_symtypes_S)
353 
354 
355 quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
356 cmd_cpp_s_S       = $(CPP) $(a_flags) -o $@ $<
357 
358 $(obj)/%.s: $(src)/%.S FORCE
359         $(call if_changed_dep,cpp_s_S)
360 
361 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
362 
363 ifndef CONFIG_MODVERSIONS
364 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
365 
366 else
367 
368 ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
369 
370 ifeq ($(ASM_PROTOTYPES),)
371 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
372 
373 else
374 
375 # versioning matches the C process described above, with difference that
376 # we parse asm-prototypes.h C header to get function definitions.
377 
378 cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
379 
380 cmd_modversions_S =                                                             \
381         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
382                 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))  \
383                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
384                                                                                 \
385                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
386                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
387                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
388         else                                                                    \
389                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
390         fi;
391 endif
392 endif
393 
394 $(obj)/%.o: $(src)/%.S $(objtool_obj) FORCE
395         $(call if_changed_rule,as_o_S)
396 
397 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
398 targets += $(extra-y) $(MAKECMDGOALS) $(always)
399 
400 # Linker scripts preprocessor (.lds.S -> .lds)
401 # ---------------------------------------------------------------------------
402 quiet_cmd_cpp_lds_S = LDS     $@
403       cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
404                              -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
405 
406 $(obj)/%.lds: $(src)/%.lds.S FORCE
407         $(call if_changed_dep,cpp_lds_S)
408 
409 # ASN.1 grammar
410 # ---------------------------------------------------------------------------
411 quiet_cmd_asn1_compiler = ASN.1   $@
412       cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
413                                 $(subst .h,.c,$@) $(subst .c,.h,$@)
414 
415 .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
416 
417 $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
418         $(call cmd,asn1_compiler)
419 
420 # Build the compiled-in targets
421 # ---------------------------------------------------------------------------
422 
423 # To build objects in subdirs, we need to descend into the directories
424 $(sort $(subdir-obj-y)): $(subdir-ym) ;
425 
426 #
427 # Rule to compile a set of .o files into one .o file
428 #
429 ifdef builtin-target
430 
431 ifdef CONFIG_THIN_ARCHIVES
432   cmd_make_builtin = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS)
433   cmd_make_empty_builtin = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS)
434   quiet_cmd_link_o_target = AR      $@
435 else
436   cmd_make_builtin = $(LD) $(ld_flags) -r -o
437   cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
438   quiet_cmd_link_o_target = LD      $@
439 endif
440 
441 # If the list of objects to link is empty, just create an empty built-in.o
442 cmd_link_o_target = $(if $(strip $(obj-y)),\
443                       $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
444                       $(cmd_secanalysis),\
445                       $(cmd_make_empty_builtin) $@)
446 
447 $(builtin-target): $(obj-y) FORCE
448         $(call if_changed,link_o_target)
449 
450 targets += $(builtin-target)
451 endif # builtin-target
452 
453 #
454 # Rule to create modules.order file
455 #
456 # Create commands to either record .ko file or cat modules.order from
457 # a subdirectory
458 modorder-cmds =                                         \
459         $(foreach m, $(modorder),                       \
460                 $(if $(filter %/modules.order, $m),     \
461                         cat $m;, echo kernel/$m;))
462 
463 $(modorder-target): $(subdir-ym) FORCE
464         $(Q)(cat /dev/null; $(modorder-cmds)) > $@
465 
466 #
467 # Rule to compile a set of .o files into one .a file
468 #
469 ifdef lib-target
470 quiet_cmd_link_l_target = AR      $@
471 
472 ifdef CONFIG_THIN_ARCHIVES
473   cmd_link_l_target = rm -f $@; $(AR) rcsT$(KBUILD_ARFLAGS) $@ $(lib-y)
474 else
475   cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
476 endif
477 
478 $(lib-target): $(lib-y) FORCE
479         $(call if_changed,link_l_target)
480 
481 targets += $(lib-target)
482 
483 dummy-object = $(obj)/.lib_exports.o
484 ksyms-lds = $(dot-target).lds
485 ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
486 ref_prefix = EXTERN(_
487 else
488 ref_prefix = EXTERN(
489 endif
490 
491 quiet_cmd_export_list = EXPORTS $@
492 cmd_export_list = $(OBJDUMP) -h $< | \
493         sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\
494         rm -f $(dummy-object);\
495         echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
496         $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
497         rm $(dummy-object) $(ksyms-lds)
498 
499 $(obj)/lib-ksyms.o: $(lib-target) FORCE
500         $(call if_changed,export_list)
501 
502 targets += $(obj)/lib-ksyms.o
503 
504 endif
505 
506 #
507 # Rule to link composite objects
508 #
509 #  Composite objects are specified in kbuild makefile as follows:
510 #    <composite-object>-objs := <list of .o files>
511 #  or
512 #    <composite-object>-y    := <list of .o files>
513 #  or
514 #    <composite-object>-m    := <list of .o files>
515 #  The -m syntax only works if <composite object> is a module
516 link_multi_deps =                     \
517 $(filter $(addprefix $(obj)/,         \
518 $($(subst $(obj)/,,$(@:.o=-objs)))    \
519 $($(subst $(obj)/,,$(@:.o=-y)))       \
520 $($(subst $(obj)/,,$(@:.o=-m)))), $^)
521 
522 cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
523 
524 ifdef CONFIG_THIN_ARCHIVES
525   quiet_cmd_link_multi-y = AR      $@
526   cmd_link_multi-y = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS) $@ $(link_multi_deps)
527 else
528   quiet_cmd_link_multi-y = LD      $@
529   cmd_link_multi-y = $(cmd_link_multi-link)
530 endif
531 
532 quiet_cmd_link_multi-m = LD [M]  $@
533 cmd_link_multi-m = $(cmd_link_multi-link)
534 
535 $(multi-used-y): FORCE
536         $(call if_changed,link_multi-y)
537 $(call multi_depend, $(multi-used-y), .o, -objs -y)
538 
539 $(multi-used-m): FORCE
540         $(call if_changed,link_multi-m)
541         @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
542            $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
543 $(call multi_depend, $(multi-used-m), .o, -objs -y -m)
544 
545 targets += $(multi-used-y) $(multi-used-m)
546 
547 
548 # Descending
549 # ---------------------------------------------------------------------------
550 
551 PHONY += $(subdir-ym)
552 $(subdir-ym):
553         $(Q)$(MAKE) $(build)=$@
554 
555 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
556 # ---------------------------------------------------------------------------
557 
558 PHONY += FORCE
559 
560 FORCE:
561 
562 # Read all saved command lines and dependencies for the $(targets) we
563 # may be building above, using $(if_changed{,_dep}). As an
564 # optimization, we don't need to read them if the target does not
565 # exist, we will rebuild anyway in that case.
566 
567 targets := $(wildcard $(sort $(targets)))
568 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
569 
570 ifneq ($(cmd_files),)
571   include $(cmd_files)
572 endif
573 
574 # Declare the contents of the .PHONY variable as phony.  We keep that
575 # information in a variable se we can use it in if_changed and friends.
576 
577 .PHONY: $(PHONY)

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